Wasn't aware of the service, but I'm pretty sure they aren't petty about such things.
To be honest I don't really think of the Scirra store as the goto place for graphics. Some of its nice, some of it, not so much.
Perhaps it's time to start pushing for more aggressive marketing on their part, I would bet they are open to positive suggestions.
Otherwise I know that templates do sell, as I've done ok with very little input into it.
Basically a working example if you think about it.